Pixel Electrode Hole Layout for Display Outgassing Defect Reduction
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Solution Overview
Problem
Display devices face defects due to outgassing, which can reduce repair productivity and affect the performance of light emitting elements.
Innovation Solution
The display device incorporates electrodes with holes of different shapes and an insulation layer around light emitting elements, allowing for the release of outgases and improving the distinction between pixels, thereby reducing defects and increasing repair efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holes of different shapes are formed in electrodes between pixels, then outgassing defects are prevented and repair productivity is increased, but electrode structure complexity increases
Solution Approach 1:
The patent applies asymmetry by forming holes of different shapes (e.g., first hole with different shape than second hole) in the electrodes between adjacent pixels. This asymmetric hole configuration enables effective outgassing pathways while maintaining pixel distinction, resolving the contradiction by using structural asymmetry to achieve reliability improvement without requiring complex additional components.
Solution Approach 2:
The patent implements local quality by varying the hole shapes at different locations between pixels rather than using a uniform structure throughout. Each region between pixels has locally optimized hole configurations tailored to specific outgassing needs and pixel identification requirements, allowing effective defect prevention while keeping the overall electrode structure manageable through localized rather than global complexity.
2Productivity
If holes of different shapes are formed in electrodes between pixels, then repair productivity is increased, but manufacturing complexity increases
Solution Approach 1:
The asymmetric hole shapes formed between pixels serve dual purposes: they enable effective outgassing to prevent defects and simultaneously provide visual or structural markers that increase repair productivity by facilitating pixel distinction. The same asymmetric structure that improves reliability also enhances manufacturability by reducing repair time through better pixel identification.
Solution Approach 2:
The differently shaped holes in the electrodes serve multiple functions simultaneously: they provide outgassing pathways to prevent defects, act as pixel boundary markers for repair productivity, and maintain electrode functionality. This multi-functionality resolves the contradiction by making the same structural feature contribute to both reliability and productivity without requiring separate manufacturing processes.
3Reliability
If insulation layer and partition walls are added around light emitting elements, then outgassing control is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the electrode structure into multiple regions with different hole shapes between adjacent pixels, and by adding partition walls that segment the space around light emitting elements. This segmentation creates dedicated outgassing pathways for each pixel region while maintaining clear boundaries, improving outgassing control without requiring a complete restructuring of the entire device.
Solution Approach 2:
The insulation layer and partition walls are integrated into the existing electrode and pixel structure, with partition walls positioned within or alongside the electrode regions. This nesting approach allows outgassing control structures to be incorporated within the existing device footprint without adding significant external complexity, as the control structures are embedded within the existing architectural framework.
Data Source
AI summary
A display device according to one or more embodiments includes: electrodes spaced apart from each other in a pixel; a bank on the electrodes and around a light emitting area of the pixel; and light emitting elements provided between the electrodes in the light emitting area, wherein the electrodes include a first hole overlapping the bank at one side of the pixel, and a second hole overlapping the bank at another side of the pixel, and a shape of the first hole of the electrodes is different from a shape of the second hole of the electrodes.